WBCS.LIVE practice question
A man rows his boat 15 km upstream and 25 km downstream, taking exactly 5 hours each time. What is the velocity of the river current?
Solve this multiple-choice question and check the correct answer with its explanation below.
Answer options
Correct answer and explanation
Correct answer: 1 km/hr
Explanation: ✅ Correct Answer: A) 1 km/hr 📚 Explanation: The upstream speed (U) is Distance ÷ Time = 15 ÷ 5 = 3 km/hr. The downstream speed (D) is 25 ÷ 5 = 5 km/hr. The mathematical formula to find the speed of the water current is (Downstream Speed - Upstream Speed) ÷ 2. Substituting the values gives (5 - 3) ÷ 2 = 2 ÷ 2 = 1 km/hr.